A Black Hole Merger Every Week? LIGO And Virgo Are Back!

TL;DR

After a year of upgrades, the LIGO and Virgo detectors have returned, now capable of detecting a black hole merger every week and even black holes eating neutron stars.

Transcript

Notice that you haven’t been hearing much about black holes crashing into each other recently? That’s because the world’s most sensitive gravitational wave hunters have been offline for the last year. Well, they're back now, with enough upgrades that they should be capable of finding a black hole merger every week, not to mention more colliding neu... Read More

Key Insights

• ↩️ The LIGO and Virgo detectors have been offline for a year but have returned with significant upgrades to their sensitivity and capabilities.
• 🤙 The upgrades include doubling the laser power, swapping out mirrors for better versions, and implementing a technique called "squeezing" to reduce quantum noise.
• 👻 Continuous observations for a year will allow for real-time detections and immediate publication of gravitational wave events.
• ✴️ Recent detections include multiple black hole mergers and a potential black hole merging with a neutron star.
• 🤩 The upgraded detectors can now detect neutron star-neutron star mergers up to 550 million light-years away.
• 🤕 The age of gravitational astronomy has begun, with dozens of gravitational wave detections expected every year.
• 👋 The Open Public Alerts and LIGO's Twitter account provide real-time updates on new gravitational wave discoveries.

Questions & Answers

Q: What are the upgrades made to the LIGO and Virgo detectors?

The upgrades include doubling the laser power, replacing mirrors with better versions, and implementing "squeezing" to reduce quantum noise.

Q: What is the significance of the continuous observations?

Continuous observations for a year allow for the detection of black hole mergers and neutron star collisions in real-time, with immediate publication of detections.

Q: What recent detections have been made by the upgraded detectors?

Detections include gravitational waves from merging black holes on April 8, April 12, and April 21, as well as a second merger between neutron stars on April 24. There is even a possibility of a black hole merging with a neutron star observed on April 26.

Q: How far can the upgraded detectors detect neutron star-neutron star mergers?

The upgraded LIGO and Virgo detectors can detect such mergers up to 550 million light-years away, 190 million light-years farther than before.

Summary & Key Takeaways

• The National Science Foundation's Laser Interferometer Gravitational-Wave Observatory (LIGO) and the European Gravitational Observatory's Virgo Instrument have undergone significant upgrades, allowing for more frequent detections of black hole mergers and collisions of neutron stars.

• The detectors have doubled their laser power, swapped out mirrors for better versions, and implemented a technique called "squeezing" to reduce quantum noise.

• Continuous observations will be conducted for a year, with detections immediately published online.